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In-Flight Observation and Surface Oxidation Modification of Tin Oxide Nanoparticles for Gas Sensing Applications

Preger, Calle LU orcid ; Jönsson, Linnéa LU ; Ternero, Pau LU ; Sedrpooshan, Mehran LU ; Bermeo, Marie LU ; Kivimäki, Antti LU ; Walsh, Noelle LU ; Messing, Maria E. LU ; Eriksson, Axel Christian LU orcid and Rissler, Jenny LU (2025) In ACS Applied Nano Materials 8(12). p.6004-6013
Abstract

Metal oxide nanoparticles are essential in various applications, and the synthesis through gas-phase generation methods offers a rapid and reliable pathway for nanoparticle production. Yet achieving precise control over their formation remains challenging due to the complex nature of oxidation processes. While bulk oxidation states can be assessed via off-line measurements, the dynamic nature of surface oxidation is more difficult to monitor and optimize in real time. Here, we investigate the surface oxidation state of unsupported tin oxide nanoparticles using an aerosol sample-delivery system and in-flight X-ray photoelectron spectroscopy. This powerful method allows the continuous monitoring of the surface oxidation of the gas-phase... (More)

Metal oxide nanoparticles are essential in various applications, and the synthesis through gas-phase generation methods offers a rapid and reliable pathway for nanoparticle production. Yet achieving precise control over their formation remains challenging due to the complex nature of oxidation processes. While bulk oxidation states can be assessed via off-line measurements, the dynamic nature of surface oxidation is more difficult to monitor and optimize in real time. Here, we investigate the surface oxidation state of unsupported tin oxide nanoparticles using an aerosol sample-delivery system and in-flight X-ray photoelectron spectroscopy. This powerful method allows the continuous monitoring of the surface oxidation of the gas-phase generated nanoparticles in real time, avoiding uncertainties associated with postcollection alterations. Tin oxide nanoparticles are widely used in gas sensing and catalytic applications, where the surface oxide layer plays a crucial role in determining their performance. Our findings demonstrate how the surface oxidation state of the free-flying particles can be controlled by adjusting the carrier gas composition, in-flight heating temperature, and particle composition. Specifically, the surface oxides of tin are partially reduced when heated in a slightly reducing atmosphere, and the reduction is further enhanced by forming mixed tin-gold nanoparticles. While previous studies on metal oxide nanoparticles have focused predominantly on bulk properties or off-line analysis, this study employs real-time in-flight X-ray photoelectron spectroscopy to investigate details of the surface oxidation state. Understanding the surface oxidation of metal oxide nanoparticles is essential to optimize processes, such as in-flight coating or subsequent deposition into a protective environment. This approach enables the exploration of direct correlations between generation conditions and surface properties, providing valuable insights into optimizing gas-phase nanoparticle synthesis.

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author
; ; ; ; ; ; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
aerodynamic lens, aerosol sample-delivery system, catalysis, in-flight, nanoparticles, oxidation, reduction, tin oxide
in
ACS Applied Nano Materials
volume
8
issue
12
pages
10 pages
publisher
The American Chemical Society (ACS)
external identifiers
  • scopus:105001504387
  • pmid:40177142
ISSN
2574-0970
DOI
10.1021/acsanm.5c00144
language
English
LU publication?
yes
additional info
Publisher Copyright: © 2025 The Authors. Published by American Chemical Society.
id
058cd944-420d-40d5-a4a0-74ccccb17140
date added to LUP
2025-08-06 12:57:36
date last changed
2025-08-07 03:11:23
@article{058cd944-420d-40d5-a4a0-74ccccb17140,
  abstract     = {{<p>Metal oxide nanoparticles are essential in various applications, and the synthesis through gas-phase generation methods offers a rapid and reliable pathway for nanoparticle production. Yet achieving precise control over their formation remains challenging due to the complex nature of oxidation processes. While bulk oxidation states can be assessed via off-line measurements, the dynamic nature of surface oxidation is more difficult to monitor and optimize in real time. Here, we investigate the surface oxidation state of unsupported tin oxide nanoparticles using an aerosol sample-delivery system and in-flight X-ray photoelectron spectroscopy. This powerful method allows the continuous monitoring of the surface oxidation of the gas-phase generated nanoparticles in real time, avoiding uncertainties associated with postcollection alterations. Tin oxide nanoparticles are widely used in gas sensing and catalytic applications, where the surface oxide layer plays a crucial role in determining their performance. Our findings demonstrate how the surface oxidation state of the free-flying particles can be controlled by adjusting the carrier gas composition, in-flight heating temperature, and particle composition. Specifically, the surface oxides of tin are partially reduced when heated in a slightly reducing atmosphere, and the reduction is further enhanced by forming mixed tin-gold nanoparticles. While previous studies on metal oxide nanoparticles have focused predominantly on bulk properties or off-line analysis, this study employs real-time in-flight X-ray photoelectron spectroscopy to investigate details of the surface oxidation state. Understanding the surface oxidation of metal oxide nanoparticles is essential to optimize processes, such as in-flight coating or subsequent deposition into a protective environment. This approach enables the exploration of direct correlations between generation conditions and surface properties, providing valuable insights into optimizing gas-phase nanoparticle synthesis.</p>}},
  author       = {{Preger, Calle and Jönsson, Linnéa and Ternero, Pau and Sedrpooshan, Mehran and Bermeo, Marie and Kivimäki, Antti and Walsh, Noelle and Messing, Maria E. and Eriksson, Axel Christian and Rissler, Jenny}},
  issn         = {{2574-0970}},
  keywords     = {{aerodynamic lens; aerosol sample-delivery system; catalysis; in-flight; nanoparticles; oxidation; reduction; tin oxide}},
  language     = {{eng}},
  month        = {{03}},
  number       = {{12}},
  pages        = {{6004--6013}},
  publisher    = {{The American Chemical Society (ACS)}},
  series       = {{ACS Applied Nano Materials}},
  title        = {{In-Flight Observation and Surface Oxidation Modification of Tin Oxide Nanoparticles for Gas Sensing Applications}},
  url          = {{http://dx.doi.org/10.1021/acsanm.5c00144}},
  doi          = {{10.1021/acsanm.5c00144}},
  volume       = {{8}},
  year         = {{2025}},
}